Increased Restlessness: The sow may become more active and agitated, seeking attention from other pigs.
Swollen, Reddened Vulva: The vulva will often appear larger and more inflamed than usual. It can become red and slightly moist.
Mounting Behavior: Sows may exhibit mounting behaviors toward other pigs, both males and females, as they are showing interest in mating.
Standing Heat (Lordosis Reflex): One of the most obvious signs, where the sow will stand still and raise her back when pressure is applied to her back. This is a strong indication that she is ready for mating.
Vocalization: Sows in heat may vocalize more, especially when they are near other pigs or boars.
Increased Interest in the Boar: When a boar is nearby, the sow may become more focused and interested in his presence, sometimes sniffing or approaching him.
Discharge: There might be a slight, clear vaginal discharge, which can indicate she is in heat.
The duration of estrus in sows is usually about 2-3 days, and mating is most effective when the sow is exhibiting strong signs of heat.
